阅读说明：本技术 电芯及锂离子电池 (Battery cell and lithium ion battery ) 是由 曾巧 江静 王可飞 于 2018-04-11 设计创作，主要内容包括：本申请提供了一种电芯,包括卷绕形成电芯的一部分的第一极片,其中,沿展开的第一极片的长度方向,第一极片具有第一端部并且第一端部的边缘形成有第一缺口。还提供一种锂离子电池。本申请的目的在于提供一种能够辨别极片的头部和尾部的电芯及锂离子电池。(The application provides a battery cell, including the first pole piece of coiling formation battery cell partly, wherein, along the length direction of the first pole piece of expansion, first pole piece has first end and the edge of first end is formed with first breach. A lithium ion battery is also provided. An object of the application is to provide a can distinguish electric core and lithium ion battery of head and afterbody of pole piece.)

The battery cell comprises a first pole piece, wherein the first pole piece is unfolded along the length direction of the first pole piece and provided with a first end part, and a first notch is formed in the edge of the first end part.

The cell of claim 1, wherein the first pole piece further has a second end opposite the first end along the length, wherein an edge of the second end is formed with a second notch.

The cell of claim 2, wherein the first notch and the second notch are disposed opposite each other along the length direction and have opposite opening directions.

The electrical core of claim 2, wherein the first end is located at a head of the first pole piece and the second end is located at a tail of the first pole piece.

The cell of claim 2, wherein the axes of symmetry of the first and second indentations are aligned.

The cell of claim 2, wherein a center of the first notch is spaced from the first end edge by a distance of 1/3-2/3 of the first end width; the distance between the center of the second notch and the edge of the second end part is 1/3-2/3 of the width of the second end part.

The battery cell of claim 2, wherein the first notch has a width 1/7-3/5 of the width of the first end portion; the width of the second notch is 1/7-3/5 of the width of the second end part.

The battery cell of claim 1, further comprising a second pole piece, wherein the second pole piece has a third end along a length of the second pole piece that is unfolded and an edge of the third end is provided with a third notch.

The cell of claim 8, wherein the second pole piece further has a fourth end opposite the third end along a length of the second pole piece, wherein an edge of the fourth end is formed with a fourth notch.

The battery cell of claim 9, wherein the third notch and the fourth notch are disposed opposite to each other along the length direction of the second pole piece and have opposite opening directions.

The electrical core of claim 9, wherein the third end is a head of the second pole piece and the fourth end is a tail of the second pole piece.

The cell of claim 9, wherein a center of the third notch is spaced from an edge of the third end by a distance of 1/3-2/3 of a width of the third end; the distance between the center of the fourth notch and the edge of the fourth end part is 1/3-2/3 of the width of the fourth end part.

The battery cell of claim 9, wherein the third gap has a width 1/7-3/5 of the width of the third end; the width of the fourth notch is 1/7-3/5 of the width of the fourth end part.

The cell of claim 8, wherein one of the first and second pole pieces is a cathode pole piece and the other is an anode pole piece.

The cell of claim 14, wherein the first gap is formed at a beginning section of the anode pole piece and the third gap is formed at an ending section of the cathode pole piece.

The cell of any of claims 1, wherein the cell comprises a first tab that protrudes from a side along the cell.

The cell of claim 16, further comprising a second tab protruding from another side along the cell, the first tab protruding in a direction opposite the second tab.

A lithium ion battery comprising the cell of any of claims 1 to 17 and a packaging bag enclosing the cell.